Scientific American 277 

 - New York  Sciam  Dez. 1997 
 - 104 
 - 20100309 
 - Scientific American  277 .
<br/><br/><label>ISSN: </label>1679-656X 
<br/><br/><label>Dewey Class. No.: </label>SAM 2010  / 2010